02554nas a2200229 4500008004100000245012100041210006900162300001200231490000700243520175400250653002902004653001802033653001402051653001402065653002002079653002202099653001502121653001902136653001402155100002302169856013202192 1999 eng d00aSocial constraints on access to mates in a high density population of New Zealand Snipe ( Coenocorypha aucklandica )0 aSocial constraints on access to mates in a high density populati a223-2390 v463 aA colour-banded sample of New Zealand Snipe (Coenocorypha aucklandica) was studied on the Snares Islands over six breeding seasons. Snipe reached densities of 11.5 birds/ha; they were serially monogamous, but alpha males regained their original partner and territory at the start of the following breeding season. Up to 47% of males and 30% of females were excluded from breeding each year, although they were tolerated within breeding territories. Breeding adults were highly faithful to their territories and mates regardless of previous breeding success. About 83% of adults were seen in the study area the year after banding. No males moved to different territories, and only 11% of females moved, all to adjacent territories. Less than 9% of breeders changed partners between years if their previous mate was still present.Territory area was not influenced by intruder density: in years of high population density a higher proportion of birds was excluded from breeding. Nonbreeding adults obtained a territory or mate only if a territorial bird died. Prior residence was an important factor in acquiring a territory both within and between breeding seasons. Mortality was density-dependent, and a relatively constant proportion of nonbreeding birds was assimilated into the breeding population each spring.New Zealand Snipe were faithful to their natal area; 46% of fledglings were later seen in the study area. There was no sex bias in return rates, but females tended to disperse slightly further than males. About 11% of males and 57% of females bred as 1-year-olds. Previously nonterritorial birds (beta status) gained access to territories and mates when alpha status birds were caring for chicks. No inbreeding was recorded.10aCoenocorypha aucklandica10amate fidelity10amigration10amortality10anatal dispersal10aNew Zealand Snipe10aphilopatry10aSnares Islands10aterritory1 aMiskelly, Colin, M uhttps://notornis.osnz.org.nz/social-constraints-access-mates-high-density-population-new-zealand-snipe-coenocorypha-aucklandica